This brief article is necessitated by the impossibility of procuring photographs and rock sections in time for incorporation in my former paper in the January number of the Geological Magazine, pp. 6–15.

Those who are acquainted with the detailed zoning of the Upper Lias and Inferior Oolite of the Cotteswold Hills have long desired to know the precise date of the Upper-Lias deposit at Leckhampton Hill, Cheltenham, upon which the Inferior Oolite rests. At last the desired-for information is to hand. The Inferior Oolite at Leckhampton Hill rests directly upon the Variabilis-Beds of the Upper Lias.

A Dyke of pre-Tertiary age is exposed in the lower course of the Usway Burn, a tributary of the Coquet. It is intruded among the Cheviot igneous rocks, and crosses the burn in a somewhat northeasterly direction. In hand-specimens the rock appears black or dark brown with a sub-vitreous lustre, and contains porphyritic crystals which are quite visible to the unaided eye. It weathers a bright red colour and even the fresh portions are streaked with red veins of agate.

The skeleton figured on Plate XII is that of a small Pliosaur, Peloneustes philarchus, Seeley, sp. This specimen was obtained from the Oxford Clay in the neighbourhood of Peterborough by Mr. A. N. Leeds, F.G.S., to whom the British Museum is indebted for a great series of more or less perfect skeletons of many species of Oxford Clay Reptiles, including the beautifully preserved and nearly complete examples of Cryptocleidus oxoniensis and the remains of Cetiosaurus leedsi, now mounted in the Gallery of Fossil Reptiles. So far as I am aware, this is the first skeleton of a Pliosaur that has been mounted so as to show the true form of the body in those reptiles. All the bones belong to a single individual, but the left-hand paddle and the distal portion of the other paddles being wanting, they have been represented by plaster models made from the paddles of another individual, which are exhibited on the floor of the case. The left ischium has been modelled from that of the opposite side.

I have already described the granular appearance of glacier ice as seen in polarized light and also the striations on the granules as shown by pencil rubbings. Last summer I succeeded in obtaining exact reproductions, in plaster of Paris, of the ice surface-structure in the upper cave in the Rhone Glacier. These are shown in Figs. 1–3.

In the little note on “Fossil Representatives of the Lithodomous Worm Polydora” which appeared in the Geological Magazine for March, 1909 (pp. 108–10), it is said that, “so far as I can ascertain, this genus has not hitherto been recorded in a fossil state.” It has since come to my knowledge that I was not the first so to record it, and I therefore ask permission to make the necessary emendation.

In a note on Archæosigillaria Vanuxemi and Bothrodendron sp., published in the Geological Magazine for February last, Mr. J. W. Jackson speculated on the age of the beds at Meathop, in which these plant remains occur, and refers to the general classification of the Lower Carboniferous rocks of the Westmorland district, which I gave in this magazine in 1907. He remarks: “It is perhaps premature to attempt to fix definitely the exact horizon of these beds, as they appear to have been as yet but superficially studied.” Since the classification above referred to was published, I have devoted such time as could be spared from professional duties to an exhaustive examination of the whole northern area, the result of which has been to confirm the general conclusions already given in this magazine. In my forthcoming account of the district, I have given a detailed description of the Meathop section. The delay in publishing a full account of the northern area has been necessitated by the general structure of the district, which required a careful study of isolated outcrops, extending over a very large area, before an accurate co-ordination of the separate exposures could be established. If any justification for this delay were needed, it is supplied by Mr. Jackson's note, in which he confesses his inability to decide upon the age of the beds displayed in the isolated exposure at Meathop on the evidence afforded by the collections obtained during his visits to that locality.